Property And Equipment

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property And Equipment

Property and Equipment

A summary of property and equipment at December 31, 2017 and 2016 is as follows:

	2017			2016
Land and improvements	$	17.8		$	21.2
Building and improvements	167.7			215.1
Computer equipment, furniture and other equipment	1,080.1			1,024.5
Computer software, purchased and internally developed	2,612.9			2,416.7
Leasehold improvements	494.0			462.4
Property and equipment, gross	4,372.5			4,139.9
Accumulated depreciation and amortization	(2,197.6		)	(2,162.0		)
Property and equipment, net	$	2,174.9		$	1,977.9

Depreciation expense for 2017, 2016 and 2015 was $110.7, $104.0 and $105.8, respectively. Amortization expense on computer software and leasehold improvements for 2017, 2016 and 2015 was $490.3, $472.0 and $409.8, respectively, which includes amortization expense on computer software, both purchased and internally developed, for 2017, 2016 and 2015 of $434.6, $411.8 and $366.7, respectively. Capitalized costs related to the internal development of software of $2,372.8 and $2,157.2 at December 31, 2017 and 2016, respectively, are reported with computer software. 

During the years ended December 31, 2017, 2016 and 2015, we recognized $2.5, $25.3 and $1.8, respectively, of impairments related to computer software, primarily internally developed. We also recognized $19.5 of impairments related to computer equipment in 2016. These impairments were due to project cancellation or asset replacement, some of which resulted from a change in strategic focus needed to effectively manage business operations in a post-ACA environment.